Profile milling machine



May 13, 1947.

J. E. LOVELY 2,420,547

PROFILE MILLING MACHINE Filed April 22, 1944 e sheets-sheet 1 mi Jaa 41(102 INVENTOR. cm/E. Lwegy ,Auk

May 13, 1947. J. E. LOVELY 2,420,547

' PROFILE MILLING MACHINE A Filed April 22, 1944 s sheets-shame May 13,1947. J. E. LOVELY PROFILE MILLING VMACHINE 'Filed April 22, 1944 6SheetsfSheet 3 107206 Elmve. l

Af/LY May 13, 1947- J. E. LOVELY 2,420,547

PROFILE MILLING MACHINE.

Filed April 22, 1944 6 Sheets-Sheet 4 IN V EN TOR M z. M

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May 13, 1947. J, E, LOVELY 2,420,547

PROFILE MILLING MACHINE Filed April 22, 1944 6 Sheets-Sheet 5 lm/ENTOR.

@Em/E. Leve?? May 13,V 1947- J. E. LOVELY 2,420,547

` PROFILE MILLING MACHINE Y Filed April 22, 1944 e sheets-sheet e l fw Wffy/( funi Marone HRSTERSTOP Patented May 13, 1947 UNITED STATES OFF'I CEl PROFILE MILLING MACHINE John E. Lovely, Springield, Vtt,assignorftoaJones St Lamson1M'achine Company; VSpringiield; Vti,acorporation of Vermontu ApplicationApril 22, 1944, Serial No. 532,287

(Cl. lille-13.7)

3 Claims. 1

The presen-tv invention relates to a milling machine andmoreparticularly toa prole milling'- machine adapted to machiney a' seriesof parallel cuts or slots to irregular Vprofiled depths inwork pieces ofsymmetrical or unsymmetrical outlines.

It is the principal object of this invention to provide a prole 'millingmachine embodying and modifying the basicprinciples of operation ofA thewell'known Fay automatic latheso that a series-of parallelislots'may beautomatically machined to desired depths of irregular depth prolesaround the outer surfaces ofV avwork'piece suclras for example acylinderl forging to thus produce a plurality` of cooling ribs thereonfor air-cooled application.

It is lalso an important object of this invention to provide a prolemilling machine having means for supporting andY rotating a work piecetogether withi means supportingv arotary cutting tool for movementtransversely of the worky axis in accordance with a'controlling proiiledcam surface to varytliel cutting depthto the desired' depth p role asthe Work is slow-ly rotated'pasty the cutting tool.

It is a further object of thisinvention to provide a milling-machineof-thecharacter described in which the rotary cutter means` isadapted tobeautomatically moved-a predetermined amount axially of the work aftereach cutting or slotting operation to the desired depth prole on thework so that an additional' cutting or slotting operation toV a' desireddepth prole may be obtained parallel' tothe iirst producedfslottingoperation, to thus enable `a rib orn of' desired thickness to beproduced on the workpiece.

Since it may bedesirable that they various parallel cutting orsl'ottingl operations be controlled to produce parallel slots ofdifferent ir regular depth proiiles, it, is` also an object of thisinvention to provide a prole milling machine of the character describedhaving a` series ofvariouslyV proled'cam surfaces adapted to beindexedintorcontrolling relation with the cuttingl means asv thecuttin-gmeans is moved axially of the work to produce the successive'parallel slots off dilerent irregular depth proles.

It is a still1further object of this invention to providea prolefmillingmachine of the characterdescribed in which the profiled cams forconftrolling the transverse movement of the cutting means into the workto desired profile depths are mounted onza s-pindle in parallel relationto` each other and are angularly located-in relation to the outlinefofthe workpiece and adapted to be rotated`v in accordance with therotation of the workpiece past` the cutting:` means, so that the.

depth ofcut atV any one= point on the work; ls

controlledito-thefrdesiredtprole depth in relationz to the outline andifunction ofthe workpiece.

The prol'e milling machine of this invention is sodesignedandconstructed as to be entirelyv automatic in-:itsL operation andenables a1 series of sequential parallelcutting. or slotting;machiningsfor cycles @to various .depthzproles. ,to be'. automatica'llyycontrolled in: relation; to' a: workpiece, suchf as for exampleancylinden forging-nto. thus produceapluralitymf cooling jilns4 or ribsthereon.

Further objectsfandadvantagesof this invention will be apparentby-reference to' the riollowing` speciiicationsf` and` drawings inwhich:

Figure lis` a rear elevationxof; the proiile -milling4 machine of' thisinvention;v

Figure 2- is a fronti'` elevation.

Figure. 3- isaan endlelevation ofl the headstockf. end of.' the machine`Figure 4 is an end elevation of the tailstockf end of the machine;

Figure 5fisa transverse'section on the line; 5-5 of; Figure 2. showing;the; relations of the profiled control cams; rotary` cutting; tooland-workpiece; Figure 6 is alongitudinalrbroken section-of the rotarycuttingtoolrspindle, and showing one optional form: ofrota-rycuttingtool, such as a bank of parallell'metal cutting saws:

Figure '7i is a, longitudinal broken section. of; tl'iefcam'y idlerroll, spindle onthe cutting meansfor@engagementsV with ,the rotary prole cams.-

Figurev` 8 is` a-i fra-gmentaryi` front`l elevation fshow-ing in detail'thefindexing means forrspacing I the: cutter -meansfaxially ofthe workand select ingthe -diferentproled control. cams for controlling, thedepth-profile ot each cutting opera.- t'n.`

Figure 9'isatsection taken on the line ,S1- lof Figure 8;

Figure .'10 is-l affsection taken on the line |.0--I0 of; Figure-9;-

Figure lleis frontdetail view of. the electrical camgcontrol drum on.rthe headstock.

`liigurewlZ is asideview of Figure lll.` FigurelS; is a fragmentary topelevation partlyin` section of the headstockl endfof the machine and:^showing the relation ofthe rotary work spindle and. the rotary. camspindle.

Figure.l 1.4 is a .diagrammatic view in perspective= ofithe hydraulicsystemof V.the machine; and

Figure 15 is an electrical wiring; diagram for the machine.

The present embodiment of thisinventiom is aman/rr automaticallyoperated and controlled by a combined electrical and hydraulic system.The rotary movements of the various parts of the machine are obtainedthrough electric motors While the axial and transverse movements of thecutter mechanism are hydraulically obtained and the whole inter-relationof movements are automatically initiated and sequenced by an electricalcontrol system, which is timed in accordance with the rotation of theworkpiece.

Referring to Figures 1 through 5 for a general understanding of theinvention, the machine is provided with a bed casting Ill, having theusual drip pan II and slide rails I2. At one end of the machine theheadstock ca-sing I3, enclosing therein the conventional spindle drivinggears (not shown), is mounted. A variable speed, direct current electricmotor I4 is belted at I5 to the drive pulley I6 of the headstock gears.A xture chuck I1, which may be specially designed for chucking aworkpiece of irregular outline such as cylinder forging, is mounted onone end of the headstock or workpiece spindle I8 and as will be morefully described in connection with Figure 13 of the drawings, is somounted on the headstock spindle I8 as to angularly and axially locatethe workpiece in relation to the profiled control cams .and the cuttermechanism. At the other end of the headstock spindle I8, and enclosed inthe housing I9, is mounted a spur gear 20, connected thru idler gear 2Irotatable around the bar 40, to a spur gear 22 keyed to a rotatablespindle 23. At the other end of the cam spindle 23 are mounted a numberof profiled control cams for controlling the variation of the transversemovement of the cutter mechanism into the workpiece in accordance withtheir proles. These cams are generally indicated by 24 of Figure 1 butare shown more in detail and will be described further in connectionwith Figures and 13 of the drawings.

Since, in the present embodiment, the gears 28, 2|, .and 22 are shown tobe of equal ratio, it should be obvious that the control cam spindle 23will be rotated at exactly the same speed as the workpiece spindle andthat the angular relation of the workpiece fixture chuck to the prolesof the cams will always be the same. The control cam spindle 23 isjournalled in suitable bearings 23a and 23h (see Figure 13) mounted inthe tubular housing 25 which is fastened to brackets 26 and 21 welded tothe headstock casing I3 and the bed I0 of the machine. A control lever28 is provided to clutch the workpiece spindle to the driving gears andthus start the machine. No provision has been made in the presentembodiment to select various gear trains and connect diiferent gearratios in the headstock to the headstock spindle, as in the presentoperation of the machine the workpiece is intended to be rotated at aspeed range varying from 1/2 to 5 R). P. M. and this range may be easilyobtained Iand controlled by varying the D. C. voltage supply to theelectric motor I4. An electrical control cam drum 29 is also geared tothe headstock spindle thru any suitable gearing (not shown) and thisgearing may be such as to rotate the cam drum 29 at half the speed ofthe headstock spindle. The function of this cam drum 23 will bedescribed further in connection with the electrical operation andcontrol of the machine.

Mounted on the slide rails I2, is atailstock assembly 30, which isadjustable longitudinally of the machine but is semi-permanently fixedin a 4 desired position by the bolts 3I. The tailstock 32 has a xture33, which may be specially designed as shown, for rotatably supportingthe workpiece 34, which in this instance is shown to be a cylinderforging. The tailstock fixture is movable into and out of supportingrelation with the workpiece by rotating the handwheel 35 as isconventional in the art. A lever 36 frictionally locks the tailstockiixture in its desired position.

Referring to Figures 1 and 3 of the drawings, a cylindrical bar 48 ismounted to the rear and above the bed of the machine. This bar 40 whichmay be of a length approximate to three-fourths the length of themachine is rotatably and slidably journalled in .bearings 4I and 42 xedto the rear of the tailstock assembly 38 and bearings 44 and 45 boltedto the rear of the headstock casing I3. A bell-crank hub 43 surroundsthe headstock end of the bar 40 and is connected to the bar 40 .by meansof a number of spline connection-s or keys not shown. Thus angularmovement of the hub 43 will cause a corresponding angular movement ofthe bar 40 although the bar may be moved axially of the hub 43. Thebellcrank 46 is connected to the piston rod 41 of the hydraulic actuator48 so that movement of the piston rod 41 causes a rotation of thecylindrical bar 4) which, as described, is also free to movelongitudinally of the machine in the bearings 4I, 42, 44 and 45.

Referring to Figures 1, 4 and 5. A bracket casting 58 is keyed to thebar 45 by means of the key 33. The bracket casting 58' is adapted tosupport the electric cutter motor 5I xed to the casting by bolts 5'2.The bracket casting 58 also is provided with a hub portion 53 (seeFigures 2 and 6) having journalled therein the bearings 54 and 55 inwhich is mounted a revoluble cutting tool spindle 56. At one end of thespindle 55 is keyed the cutting tool 51 which in this instance is ametal cutting saw and at the other end of the spindle a pulley 58 iskeyed. Belts 59 connect the motor 5I to the pulley 58 of the cuttingtool spindle. Also journalled on the bar 4i) but not keyed thereto isthe cam roller bracket support (i0. The support 6I) is fastened to thesupport 58 by means of the bolts 6I passing through the arcuate slots 52of'th'e support 50. By loosening the bolts 6I, the adjustably xedangular relation of the support 68 to the support 50 may be adjustedwithin the limits of the arcuate slots 62. To enable a preciseadjustment of this relation to be obtained, the adjusting screws 63 and64 threaded in the lugs 55 and GS which are part of the support 50 areprovided to abut the lug 61 which is a part of the support 68, andmovement of the adjusting screws against the lug 61 will therefore causea precise angular movement of the housing 58 in relation to the housing50. The housing 60 is enlarged at its free end, as shown, to provide ajournal 18 (see Figures 1 and '1) having positioned therein the bearingassemblies 'II and 12 for revolubly supporting a cam idler or followerroll spindle 13. The spindle 13 is prevented from axial movement by theadjustable collars 14 and 15 and the shoulder 16. Fastened to theshoulder 16 by the bolts 18 is the cam idler or follower roll or disc11. The supports 50 and 60 are prevented from axial movement along thebar 40 by means of split collars 88 and 8I clamped to the bar 40 as bythe bolt 82. Since the support 5I] is keyed to the bar 40 and thesupport 68 is fastened to the support 50, it should be apparent thatangular movement of the bar 40 will cause a corresponding movementamasar offt-he supports 50 and' 60; enabling-thecutting t'ool- 5T- to bemoved transversel-y of ther work axis;`

and-bringingthe cam idler-roll' '|"I` into or out ofengagementwith oneofthe proledcams 24; as shown; byFigure 5j.

By supplying a constantl fluid pressureto one endoff the actuator 43during the cutting opera tion', theA supports 59" and 6D will'v beconstantly urged to feed the cutter mechanism` transversely intol theworkpiece and. keep the cam idler roll 'II in contact with one of theproled cams 24, as.

thetime of machineassembly; the cams 2111` are angularly positioned andfixed on the cam spindle 23L in relation to the angular position of theworkpiece and" its outline as determined by the special fixture |"I-,andtherefore, the depth profile forth'e cutting operation willbeproperly synchron-ized with the outlineof the workpiece.

Referring to' Figures l, 2; 4 and 810i the drawings,A apparatus isprovided-for moving the cutter and cam idler roll assembly axially ofthe workpiece tol enableA a series of slots to be machined? parallel toeach other on the workpiece. Since eachsuccessive slot may be of adiierent depth profile, a plurality of differently profiled cams 24,equal innumberto the number of diie-rently profiled parallel` slots, maybe mounted on the cam spindle 2:31 asrshown by Figure 13 and the axialmovement of theV cutter assembly before each` successive slotting`operation will bring the cam--` idler roller 'FI` into controllingrelation with successive ones of the differently profiled cams 24;

The mechanismfor controlling the axial movement of the cutter assemblyis mountedon a supporting, framework 9|] which is slidably mounted onthe sliderails I2"beyond the tailstock assem bly. Pivotally carried at9| by the framework 95' is a` rocker arm 92; One end of the rocker arm92 is pivotally connected at SS'to the bar 40- and the other end oftherocker arm 92 is pivotally connected at 94`to the pistonA rod 95 ofahydraulic actuator 915.' The hydraulic actuator QB- is pivotallysupported at 91' by the framework 9%. The framework S carrying theactuator SS and the rocker arm 92' is movable along the slide rails I2andadjustedin precise relations to the workpieceby. means of handwheelwhich is keyed to thethreadedadjusting rod'99 connected to the framework90 and'passing through the threaded bracket [B iixed to the machine bedBy rotating theY handwheel 93, the framework 90 is moved, longitudinallyof the machine bed and hence through the rocker armY 92 carried by theframework 9|); the bar 45 is correspondingly moved ,longitudinally oraxially. This enables the bar and cutter assembly to be initiallyadjusted axially of,` the workpiece to bring the camidler roller 'Mintocorrect alignment withv the first of theprofled cams 24 and also tobring'the cutting` tool` to the desired cutting point axially of theworkpiece as determined by th'e special fixture-I1. After a slot to thedesired depth prole hasfbeenmachined as previously described, fluidpressure is supplied to the actuator 48 in a manner torock the bar 4i!"and move the cutting tool T and'` the cam idler roller I1 out ofengaging relatiollswith the workpiece and proled control cam...Hydraulic pressure is then supplied to the actuatorA Shin such manner asto move thepiston rod rocker arm 92" and bar; so' that the bar of thedrawings.

ll'carrying thecutter assembly willlbermovedtohward'- the headstock endof the machine againsta positive stop and. with the cam idler roller 11clearing the: group of profiled control` cams 24'-, While the bar 4Gisat the extreme end of' its` travelA1 towards-theheadstockend oi themachine an index plate Il is rotated to bring a successive adjustablestop` |02 into position for determining the limit oireturn for the bar4t inthe directionof the tailstock and hence aligning the cam` idlerrollerll with a successive profiled cam andspacinglthe cutter 51 axiallyof th'e workpiece in relation tov the rstproduced slot to*` determinethethickness of the iin to be producedby the parallel. slot.

The mechanism for rotating. the index plate IUI is shown in detail'byFigures 2, S, 9 and110f The framework QIliis journalledf at IIO and IIIto' receive a shaft. I|2 transverse to the spindle and on one end oilwhichis. keyedl the index plate IIJ'I, held on the shaftby the` collarI|3 Thev collar I|4 cooperateswith the collar I I3 and index plateIElIl-to axially align the shaft I I2` in the journals4 II0 and I ITI.Also keyed' on the shaft IIZ is the brake drum Ilaround which a springloaded brake |151 is constantlyA braked toassure that the shaft II24`can notbe rotated except when1 desired and' to assure thatl the rotationof the shaft II2 will cease imme diately upon the cessation of a forceIapplied to rotate the shaft against. the tension'` of the brake.Supported by the bracket II'I of the framework 90, is a hydraulicactuator IIS` having a piston rod IIS connectedto a shaft |205,centrally and slidably mounted on the framework St' atl right angles toand beneath the shaft II2. Alsokeyed to the shaft IIZ' is the anged hubI 2| having a plurality of lugs |22, equal in number to the number ofadjustable stops |02 on the indexY plate |0| radially spaced and locatedin relation to the radial spacing of the adjusting stops M32; Pivotallymounted at |23 within a slot |211" of' the: shaft I 20 is a latch member|25, normally maintained by the spring plunger |26 in the positionhshown by Figure 10. When fluid pressure is supplied to the actuator IIB'in a manner to cause the shaft |20' to be moved toward the headstockAend of the machine, the spring .latch |25 abuts one of the lugs I22-onthe iiange |2L|` and causes a rotation of the shaft I-I2 and index.plate IIJi'. The mechanism just described is so designed andproportioned as to rotate the index plate |91, an angular amount equalto the angular spacing of the adjustable stops |02. Upon supplying thefluid pressure to the actuator IIB in such manner as to move the shaft|21] in the direction away from the headstock end of the machine, thespring latch |25 will'be depressed in passing the lug I22 in its path,thus acting as an escapes` ment, so that the shaft ||2f can be rotatedonly in one direction and by the proper direction of movement of theshaft |25, towards thel headstock end of the machine.

To accurately locate and lock the index plate IDI in each of itssuccessive angular positions, a locking bolt |30 having a flattened end|3I, is provided. The index plate ISI is also provided with a series ofrecessed inserts |32, having openings shaped to cooperate with the end|3-I of the locking bolt |38. These inserts are accurately angularlypositioned on the index plate in relation to the adjustable stops toassure the indexing4 of the stops at the exact positions to cooperatewith the adjustable stop- |33 on the bar- 4i).4 The locking-bolt |30 isnormally heldin the-lock- 7 ing position of Figure 10 in response to thelever |34 pivote'd at |35 and urged by the spring |36 and plunger |31 tothe position shown. A pivoted latch member |38 cooperates with a camsurface |39 fixed to the bar |20 so that a movement of the bar in adirection to rotate the index plate causes the locking bolt |30 to firstbe withdrawn from locking relation to the index plate I0 I. At the endof the index plate rotating stroke of the shaft |20, the latch |38 isdropped into the recess |40 of the cam surface |39, causing the lockingbolt |30 to be moved into locking relation with the succeeding recessedinsert |32 for the new angular position of the index plate |0|, thusindexing a succeeding adjustable stop |02 to cooperate with the stop |33of the bar 40, the stop |02 then being alined with the bar. Due

to the pivotal effect of the latch |38, the return stroke of the shaft|20, does not affect the locking bolt mechanism. In order that theoperation of the machine may be more fully understood, a complete cycleof operation will now be described. A workpiece (in this example acylinder forging) is placed in the headstock fixture |1 and clampedthereby adjusting the tailstock 32. The fixture |1 may be so designed as-to angularly locate the outlines of the workpiece in relation to theoutlines of the profiled cams 24. The handwheel 58 is then turned toadjust the axial position of the cutter mechanism to bring the cam idlerroller 11 into correct alignment with the rst of the cams 24,controlling the depth profile of the first cut. The cams positioned onthe cam spindle at the time of machine assembly are in the correct axialrelation to the workpiece xture |1 so that with the cam idler roller 11in correct alignment with the first of the cams 24, the cutting tool 51is axially positioned to the workpiece at the point where the first cutis to be produced. Current is supplied to the motor I4, to cause therevolution of the workpiece and cam spindle at a desired speed. Fluidunder pressure is supplied to the actuator 48 in a manner to causetransverse movement of the cutting tool into the workpiece 34 asdetermined and limited by the profiled cam 24 in association with thecam idler roller 11, attached to the cutter mechanism as previouslydescribed. At the completion of one revolution of the work past thecutting tool in cutting relation to produce a slot having a ldepthprofile corresponding to the profile of the profile cam surface, fluidunder pressure is supplied to the actuator 48 in a manner to cause thewithdrawal of the cutting tool from the workpiece and the cam idlerroller from the control cam. Fluid under pressure is then supplied tothe actuator 96 to move the bar 40 and the cutting mechanism towards thehea'dstock until the adjustable stop |33 will clear any of theadjustable stops |02 on the index plate |0I. With the bar in thisposition, fluid pressure is supplied to the actuator |8 to move theshaft |20 towards the headstock end and cause the index plate |0| to bemoved and locked into the next index position of the adjustable stops|02 in relation to stop |33. The application of fluid pressure toactuators I8 and 96 is then reversed and the shaft |20 and the bar 40are moved in a direction away from the headstock end of the machine. Themovement of the bar 40 is now limited by the new adjustable stopposition |02 to axially locate the cutting mechanism and cam idlerroller in relation to the workpiece and a successive profiled cam tothus produce a second cut or slot on the workpiece parallel to the firstproduced slot and controlled to desired depth profile by the successiveprofiled cam. The cycle of operation is then repeated through as manyindexed stop positions and profiled control cams as may be desired. Inthis connection it may be noted that an optional form of cutting tool 51is shown by Figure 6 of the drawings to be a multiple bank of metal sawsand this type of cutting tool gives a plurality of identical depthprofiled slots for each indexed position of the cutting mechanism.

In order that the cycle of operation just described above may beautomatically initiated and sequenced to obtain completely automaticoperation of the machine, a combined hydraulic and electrical controlsystem is employed. Figure 14 of the drawings show a diagrammatic Viewin perspective of the hydraulic system including the solenoid operatedhydraulic valves. A storage tank |50 for hydraulic fluid is providedwith an electric pump motor |5| and a double barrelled rotary pump |52mounted thereon. When the pump |52 is operating, fluid is drawn from thetank |50 through the line |53 and discharged under pressure into thelines |54 and |55. The fluid pressure in line |54 is supplied to thesolenoid valve |56 which selectively supplies fluid under pressure toeither side of the actuator 40 for moving the bell crank 46 and hencethe bar 40 to feed the cutter mechanism into or withdraw it from theworkpiece. When the solenoid 306 is energized fluid under pressure fromline |54 passes through valve |56 into line |51 and to the check valve|58. The check valve |58 is so constructed as not to permit the passageof fluid under pressure from line |51 to line |59. The fluid pressuretherefore passes from line |51 into line |60 from which it enters ametering valve |6| of conventional design. The metering valve |6| may beadjusted to vary the pressure passing from line |60 to line |59 and theexcess fluid under pressure is drawn off through the drain line |62connected to the storage tank. The metered pressure in line |59 is lessthan the pressure in line |51 and therefore does not pass through thecheck valve |58 but instead passes through line |63 to the hydraulicactuator 48 at the bottom end of its cylinder to move the piston 41 andbell crank 46 and feed the cutter mechanism into contact with theprofiled cam and the work as previously described. While supplyingmetered fluid pressure to the line |63, the uid on the other side of thepiston in the actuator 48 is discharged through the line |64 into thesolenoid valve |56 where it is passed to the drainage line |65 connectedto the storage tank |50. When the cutter mechanism is to be withdrawnfrom the workpiece, the solenoid 306 is deenergized and solenoid 301 isenergized to actuate the valve |56 and supply fluid pressure throughline |64 to the top of the actuator 48. The fluid in the bottom of theactuator is drained through line |63, line |59, check valve |58 and line|51 to the solenoid valve |56 whence it passes to drainage line |65connected to the storage tank |50.

To obtain and index the axial movements of the cutter mechanism relativeto the workpiece and the profiled control cams while the cuttermechanism is withdrawn from the workpiece, the fluid pressure in line|55 is supplied to the solenoid valve |66 which selectively suppliesfluid pressure to lines |61 or |68. With the cutter mechanism withdrawnfrom the workpiece, sole- 11 from line |99 thru the normally closedcontacts of the motor generator stop switch 2|5 and line 2| 6, thrurelay coil 3I1 and normally closed overload switch contacts 3I8a to line206 completing a circuit. When relay coil 3|1 is energized, the normallyopen contacts 3I1a, b, and c in lines '2I1, 2|8 and 2I9 are closed,energizing the motor generator motor I9I. At the same time the normallyopen contacts 3I1e in holding circuit 229 in parallel with the pushbutton switch 2|4 are closed, thus assuring the continued energizationof relay coil 3 I1 after the push button switch 2 I4 is released. Withthe motor generator motor I9! and the pump motor I 5I now operating, thenext operation is to depress cycle start switch 222 which is a normallyopen three contact push button switch. The current from the nowoperating exciter armature |95 which is present in line 22| is connectedby the depressed cycle start switch 222 to lines 223 vand 224. Thecurrent in line 223 passes thru relay coil 3| 9 and normally closedoverload switch contacts 3I8b to line 225, completing its circuit backto the exciter armature |95. Relay coil 3I9, when energized, closes thenormally open contacts 3|9a of the holding circuit 2II in parallel withthe cycle start push button. 222 so that the push button may now bereleased and the relay coil 3I9 will remain energized because contacts 3I2a, 3| 9a and 3051 are all closed if the pump circuit is completed aspreviously described. Relay coil 3I9, when energized, also closes thenormally open contacts 3 I 9b in line 226 connecting the exciter voltagein line 22| to the rheostats |96 and |91. The circuit is completed fromeither potentiometer |96 or potentiometer |91 thru lines 221 or 221a andthe contacts 3|4a or 3|4b to energize the eld |94 of the spindle motor I4 for fast or slow motion as desired. This action will be describedfurther. Relay coil 3I9 also closes normally open contact 3|9c in line228 which connects the armature of the spindle motor I4 to the generatorarmature |93. Overload relay coils 3| 8 in the circuit of the motorgenerator motor I9I and the armature of the spindle motor I4 aresuiciently energized in the event of overload to either of these unitsto thereby open the normally closed contacts 3I8a and 3I8b and thusdeenergize relay coil 3I9 to therebydisconnect the spindle motor fromits motor generator, or deenergize relay coil 3|1 and disconnect themotor generator motor I9I. A conventional circuit for providing dynamicbraking of the spindle motor I4 when its eld |94 is deenergized isprovided by the relay coil 320 which is of high resistance compared tothe armature of the motor I4 so that it is not energized by the motorgenerator. When the motor `eld |94 is deenergized, however, a current isgenerated in the armature of the coasting motor I4 due to residualmagnetism in the field |94 and this current energizes relay coil 320,closing normally open contacts 320e and dissipating the generatedcurrent in the resistance 229, thus effecting a dynamic brake for thespindle motor Depressing the cycle start push button 222 to energizeline 223 and start the spindle motor i0 as described also suppliescurrent to the line 224 which energizes the closed coil 3I9 of a latchedrelay which closes its two normally open contacts 3|0a and 3I0b in lines2I0 and 230 and opens its two normally closed contacts 3I0c and 3|0c inlines 23m and 202. The opening by the latched relay of contacts 3|0c inline 23| a immediately deenergizes the closed coil 3I0 of the latchedrelay, while the opening of normally closed contacts 3 I0e deenergizesrelay coil 3|2 assuring that its normally closed contacts 3I2a in theholding circuit for the spindle moto-r will remain closed to allow thespindle motor I4 to continue to run. The closing by the latched relay ofthe normally open contacts 3I9a in line 230 conditions the circuit ofthe trip coil 3II of the latched relay so that it will be operative uponthe future closing of the normally open contacts 32 Ia in line 23| atthe end of a sequence of cycle operations on a workpiece. The closing bythe latched relay of the normally open contacts 3I0b in line 2|0,supplies current through the contacts 30511, which as previouslymentioned are closed if the pump circuit is energized thus supplyinglines 232 and 233 with current for further operations.

It will be remembered that the control cam drum 29 operates at one-halfthe speed of the workpiece and cam spindles and hence moves through 360of rotation to 720 of rotation for the workpiece. With the pump andspindle motors now operating the cam drum 29 will be turning tobringcams |80, I8I, |82, |83 and |84 into contact with their respectivesnap switches 300, 30| and limit switch 302. At the time of beginningthe cycle of operation to be described, the contacts 30|a of snap switch30| are closed to energize relay coil 3|4, which opens normally closedcontacts 3|4b and closes normally open contacts 3I4a to connect thespindle motor iield |94 with the fast motion potentiometer |91, causingthe spindles and cam drum 29 to revolve in fast motion. As the cam drum29 revolves, the cam dog contacts switch 300 which is a double pole,double throw, snap switch and the cam dog |80 is shaped such as to throwlimit switch 380 into a position closing contacts 390a and openingcontacts 30019, thus energizing solenoid 308 of ihe hydraulic valve |56and causing the cutter mechanism to be fed transversely in towards theworkpiece. As the cutter mechanism advances towards the workpiece, thearm 60 actuates snap switch (not shown) to close the contacts 322a andenergize relay coil 3I3 which closes normally open contacts 3|3a, 3I3band 3I3c, to connect the cutter motor 5I through overload release coils323 to the three-phase line |90. In the event of overload on the cuttermotor 5|, the coils 323 will be suiciently energized to open thenormally closed contacts 32311. and deenergize relay coil 3I3, thusdisconnecting the motor 5| The metering Valve IBI is adjusted to timethe cutter mechanism to be fully moved transversely into the workpieceas limited by the profiled cam 24 when the workpiece spindle hasrevolved approximately 60 from its starting point. At this point, thecam drum 29 has moved 30 and the cam dog |83 will then contact andoperate the snap switch 39|, in such manner as to open contacts 30Ia anddeenergize relay coil 3I4, restoring normally open contacts and normallyclosed contacts 3I4a and 3|4b to their normal positions and connectingthe eld |94 of the spindle motor I4 to the slow motion potentiometer|96, giving a speed of about 1 R. P. M. to the workpiece and profiledcam spindles. This is the relatively slow speed suitable for cutting,the high speed being employed at other times in order to reduce the idleor non-cutting time during the cycle. The rotation of the workpiece nowcontinues for 360 of movement with the cutter mechanism operating toproduce a slot of proled depth. 360 of rotation for the workpiece willbe 180 of movement for the control drum 29. At this point,

work piece, cutting means movable transversely of said spindle into andout of cutting relation to a Work piece rotatable with said spindle,profile control means including .cams rotatable with said work spindleand a follower for said cams controlling movement of said cutting meanstransverse to said spindle while in cutting relation to the work piece,means for moving said cutting means and follower transversely into andout of cutting relation to the work piece and cooperative relation toone or another of said cams, respectively, means effective on eachcomplete rotation of said work spindle for actuating said moving meansto retract said cutter and follower from the work piece and cam,respectively, means for moving said cutter and follower lengthwise ofsaid axis, means for actuating said moving means while said cutter andfollower are so retracted to move said cutter and follower lengthwise ofsaid axis to a retracted axial position, a plurality of indexable stopsdetermining different axial distances from said retracted positioncorresponding to operative positions of the several rotatable cams,means actuated by said axially moving means to index said stops topresent them successively into operative position, means actuating saidaxially moving means to move said tool and follower away from saidretracted axial position as far as permitted by the particular stop thenin operative position, and means for then actuating said cutter movingmeans to move said cutter relative to the Work and Said follower incontrolled relation to the cam corresponding to the axial positiondetermined by the operative stop,

2. In a machine tool, a rotatable work piece spindle, means on saidspindle for supporting a work piece, cutting means movable transverselyof said spindle into and out of cutting relation to a work piecerotatable with said spindle, control means including cams rotatable withsaid work spindle and a follower for said cams controlling movement ofsaid cutting means transversely of said spindle while in cuttingrelation to the Work piece, means for moving said cutting means andfollower transversely into and out of cutting and cam-controlledpositions, respectively, means effective when said Work piece hascompleted a revolution for actuating said moving means to remove saidcutting means from cutting position and said follower fromcam-controlled relation, means for moving said cutting means andfollower longitudinally of said axis, a stopcarrying member indexableabout an axis, a plurality of stops carried by said member eachcorresponding to one of said cams and deiining by contact therewith of apart movable axially with said cutting means and follower limitingpositions for said longitudinal moving means, means effective to actuatesaid longitudinal moving means when said cutting means and follower arein retracted lateral position to a retracted axial position and then inthe opposite direction to an operative limiting longitudinal positiondetermined by the stop then in indexed operative position, and meansactuated by said axial motion of said cutting means and follower forindexing said stop-carrying member.

3. In a machine tool, a rotatable work piece spindle, means on saidspindle for supporting a work piece, a rockable and axially movable bararranged parallel to said work piece, a cutter arm carried by said bar,a cutter carried by said arm to move toward and from a work pieceycarried by said supporting means by rocking of said bar to feed andretract said cutter and to be indexed axially of the work, a rotaryshaft parallel to said spindle, a plurality of contour cams secured tosaid shaft, means connecting said shaft and spindle for simultaneousrotation, a cam follower arm carried by said bar, a follower on saidfollower arm for engagement selectively with said contour cams accordingto the axial position of said bar, means actuable to rock said bar tobring said follower against and hold it in contact with one of said camsand to move said cutter toward the work piece or to retract saidfollower from said cam and said cutter away from said work piece, atransverse shaft beyond one end of said bar, a carrier supported on saidtransverse shaft, stops one corresponding to each contour cam carried bysaid carrier and spaced angularly about said transverse shaft andselectively positioned by indexing of said transverse shaft in alinementwith said bar, means for moving said bar axially, a xed stop limitingsaid axial movement away from said carrier stops, means for actuatingsaid axial moving means to move said bar against said xed stop when saidcutter means and follower are retracted, carrier indexing means actuablewhen said bar is so moved to bring a different carrier stop into linewith said bar, means actuable thereafter to move said bar axially intocontact with said different stop, and means for then actuating saidbar-rocking means to return said cutter to the work piece and saidfollower to the cam corresponding to the carrier stop then in stoppingposition.

JOHN E. LOVELY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

